Design of a Fluxgate Weak Current Sensor with Anti-Low Frequency Interference Ability

Xiangyu Tan, Wenyun Li, Guochao Qian, Gang Ao, Xiaowei Xu, Ran Wei, Yi Ke and Wenbin Zhang ()
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Xiangyu Tan: Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650504, China
Wenyun Li: China Southern Power Grid, Yunnan Power Grid Co., Ltd., Kunming 650011, China
Guochao Qian: Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650504, China
Gang Ao: Yunnan Power Grid Co., Ltd., Kunming Power Supply Bureau, Kunming 650001, China
Xiaowei Xu: Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650504, China
Ran Wei: Faculty of Science, Kunming University of Science and Technology, Kunming 650504, China
Yi Ke: Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650504, China
Wenbin Zhang: Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650504, China

Energies, 2022, vol. 15, issue 22, 1-14

Abstract: According to the requirements of weak current measurement in power grid, a weak current sensor with anti-low frequency interference ability is developed. The sensor adopts the principle of fluxgate detection and adds a magnetic ring on the original basis. The structure of the magnetic ring is simulated using comsol to further improve detection sensitivity. In order to solve the problem that the electromagnetic current sensor is vulnerable to the interference of geomagnetic field and power frequency magnetic field in weak current measurement, a magnetic shielding method with low cost is selected, and the shielding shell structure is designed using a finite element analysis method. The experimental results show that the minimum measurable current is 1 mA, the measurement range is 1 mA–1 A, and the bandwidth is DC-16 kHz. The designed magnetic shielding shell can effectively reduce 97.3% of the DC magnetic field interference and 95.7% of the power frequency magnetic field interference. The sensor can realize accurate measurement of weak current in power grid.

Keywords: weak current measurement; anti-low frequency interference; fluxgate principle; magnetic ring; magnetic shielding method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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